diff --git a/lib/kamal/cli/app/boot.rb b/lib/kamal/cli/app/boot.rb
index d9ef5093..9e36cb43 100644
--- a/lib/kamal/cli/app/boot.rb
+++ b/lib/kamal/cli/app/boot.rb
@@ -48,7 +48,7 @@ class Kamal::Cli::App::Boot
       audit "Booted app version #{version}"
       execute *app.run(hostname: "#{host}-#{SecureRandom.hex(6)}")
       if running_proxy?
-        execute *KAMAL.proxy.deploy(app.container_name(version))
+        execute *KAMAL.proxy.deploy("#{app.container_name(version)}:#{role.port}")
       end
     end
 
diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index b32c0f94..a181b7b3 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -6,7 +6,7 @@ require "erb"
 require "net/ssh/proxy/jump"
 
 class Kamal::Configuration
-  delegate :service, :image, :servers, :labels, :registry, :stop_wait_time, :hooks_path, :logging, to: :raw_config, allow_nil: true
+  delegate :service, :image, :port, :servers, :labels, :registry, :stop_wait_time, :hooks_path, :logging, to: :raw_config, allow_nil: true
   delegate :argumentize, :optionize, to: Kamal::Utils
 
   attr_reader :destination, :raw_config
diff --git a/lib/kamal/configuration/role.rb b/lib/kamal/configuration/role.rb
index 9749189a..69cf189b 100644
--- a/lib/kamal/configuration/role.rb
+++ b/lib/kamal/configuration/role.rb
@@ -16,6 +16,10 @@ class Kamal::Configuration::Role
     @hosts ||= extract_hosts_from_config
   end
 
+  def port
+    specializations["port"] || config.port || "3000"
+  end
+
   def cmd
     specializations["cmd"]
   end
diff --git a/test/integration/docker/deployer/app/config/deploy.yml b/test/integration/docker/deployer/app/config/deploy.yml
index b504a138..a8e541c4 100644
--- a/test/integration/docker/deployer/app/config/deploy.yml
+++ b/test/integration/docker/deployer/app/config/deploy.yml
@@ -3,6 +3,7 @@ image: app
 servers:
   - vm1
   - vm2
+port: 80
 env:
   clear:
     CLEAR_TOKEN: 4321
diff --git a/test/integration/docker/deployer/app_with_roles/config/deploy.yml b/test/integration/docker/deployer/app_with_roles/config/deploy.yml
index 2c2ca14f..1dc63948 100644
--- a/test/integration/docker/deployer/app_with_roles/config/deploy.yml
+++ b/test/integration/docker/deployer/app_with_roles/config/deploy.yml
@@ -9,6 +9,7 @@ servers:
     hosts:
       - vm3
     cmd: sleep infinity
+port: 80
 
 asset_path: /usr/share/nginx/html/versions